Vivo, a global smartphone brand, has made good impressions to tech enthusiasts at the SM Cyberzone’s Mobile Fest 2018. Tech experts Mark Macanas of TechPinas and Alora Guerero of Revu explained the features of Vivo’s latest flagship phone, Vivo X21 that includes unique unlocking technologies, dual rear camera, AI selfie camera, AI game mode, Hi Fi performance and device. …